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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d6facb0ee7a56890876becc4b65dbcd402b7ea549025f94c6fe0761ad7bffe' 
  AND token = 'T/V98/UxRA258IMLfMAM3OaZI15ZuV7lQSFpT+PSgV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}